Fix test fixture: seed countries before companies referencing them

companies.country_code has a real FK to countries -- real ingestion
always calls get_or_create_country first (see _replace_movie_companies),
but the company browse test fixture called get_or_create_company
directly with a raw country code, violating that FK. Found by actually
running the tests against Postgres on the devbox.

Co-Authored-By: Claude Sonnet 5 <[email protected]>

tests/integration/test_company_browse.py

@@ -12,7 +12,7 @@ from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.models.enums import CompanyType
 from app.repositories.provider_repository import get_or_create_provider
-from app.repositories.reference_repository import get_or_create_company
+from app.repositories.reference_repository import get_or_create_company, get_or_create_country
 from app.services import company_service
 
 _COMPANIES = [
@@ -25,6 +25,8 @@ _COMPANIES = [
 
 async def _seed_companies(db_session: AsyncSession) -> None:
     provider = await get_or_create_provider(db_session, "tmdb", "TMDB")
+    for code in {country for _, _, _, country in _COMPANIES}:
+        await get_or_create_country(db_session, code, code)
     for external_id, name, company_type, country in _COMPANIES:
         await get_or_create_company(
             db_session,